Visa requirements for the Philippines vary depending on your nationality and the purpose and length of your visit. Some nationalities are allowed to enter the country without a visa for a specified period of time, while others need to obtain a visa before arrival. It's best to check with the Philippine embassy or consulate in your country for specific visa requirements. Read more about Philippines Visa here.
For example: If a U.S. Citizen planning to enter and visit the Philippines: No visa required for a stay not exceeding thirty (30) days. Traveller must hold valid ticket for return journey to country of origin or next country of destination and a passport valid for a period of at least six (6) months beyond the stay in the Philippines.